Myners’s involvement in Aspen Insurance Holdings (AIH) have emerged as Gordon Brown seeks to win the backing of heads of government to prise open tax havens.

Myners, earned nearly £200,000 from AIH in one year.

Myners held 318,338 share options. The shares, which are listed on the New York Stock Exchange, closed at $21.64 on Friday.

Myners, financial services secretary to the Treasury and former chairman of the Guardian Media Group, was awarded the majority of the share options at an exercise price of $16.20 a share in August 2003, a year after he helped to start the company.

Myners declined to say whether he had exercised the shares. (a spokesman suggested he had not)

Myners, who is also leading the government’s clampdown on City bonuses, received a farewell bonus of £50,000 for his final four months at Aspen.

Myners helped to launch a government investigation into the tax lost through havens, saying: “Off-shore financial centres must play a responsible role in the global financial system.”

Myners faces a challenge to his account to the Treasury select committee last week in which he said he did not know the full cost of Goodwin’s RBS pension.

Sir Tom McKillop, the former chairman of RBS, has written to John McFall, the committee’s chairman, insisting that Myners was told the full value of Goodwin’s £703,000-a-year pension.

Michael Fallon, deputy chairman of the committee, said: “If the letter contradicts what Lord Myners told the committee then it could be very serious for him.”

"'Lord' Myners, financier to the Government Of The Unelected. GUILTY". puts on black cap, gets out the blindfold." You will be taken from this place and hanged around the neck until you are dead, take him down".

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